Powertrain, generic · Transmission

P094C Hydraulic Pump Performance/Stuck Off

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modePossible

The pump is commanded on but does not deliver: it does not turn, turns too slowly or produces too little pressure. The module judges this from pressure or speed feedback. No manufacturer documents this exact code publicly. Mercedes reports a comparable condition of the electric auxiliary oil pump on the 722.9 automatic under P0944; its test plan checks connector and fuse, supply voltage, CAN lines and software, then a check valve in the converter housing, before the pump is replaced. Hyundai lists a stuck high-flow pump on its 8-speed DCT as P193E71. CARB requires functional checks on outputs. P094B is the opposite fault, P094A the driver, P0944 the pressure loss of the whole unit.

Likely causes

Air in the pump after service or a suction leak
Seized or failed pump motor
Blocked strainer or leaking check valve
Supply or relay fault stopping the pump

Symptoms

  • Warning light on
  • Engine restarts at once or stop-start not available
  • Delayed engagement or lost drive

Repair estimate

DifficultyHardWorkshop job
Parts and labour€100–1,800
Time1–5 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

hydraulic pumptcm

Related codes

P094BP094AP0944P0C2A

References: static.nhtsa.gov, static.nhtsa.gov, law.cornell.edu.